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Speedometer electrical??
I just noticed my speedometer / odometer was not moving at all. I know it was yesterday as the wife was giving me crap going to fast
 Is there an electrical component to the speedometer? I am only experienced with cables.... Where does the cable / wiring go? Thanks!
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1978 911 Turbo Cab Conversion w/1987 930 Engine Last edited by trapper_canada; 10-04-2012 at 08:13 PM.. |
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06-30-2012, 10:35 AM
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Registered
Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
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Porsche and many other manufactures use an electric drive speedo. I think Porsche was an early convert (in the early mid 70s) I have forgotten the exact year. There is a sending unit in the transaxle . The wires come into the car under the rear centre where the shifter coupler is. I have seen the wires get tangled in the shift shaft. If you are lucky thats where your problem is Otherwise you have a lot of wire tracing to do.The sender will show a pulse on an ohm meter if you find the right connections and turn the engine over.
Oddly there is also a connection from the automatic heter control which runs through the speedo. I had my speedo burn up on my 1986 and it stopped the heater from working.
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1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 Last edited by johnsjmc; 06-30-2012 at 02:09 PM.. |
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06-30-2012, 01:23 PM
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Join Date: Aug 2008
Location: sectors R&N, SE Pa
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It looks like there is a fused line to the speedo. This schematic is on our hosts main page.
You might want to check the fuse and pull the instruments and check back there to inspect for damage to adjacent wiring so you can asses / isolate the problem - maybe chaffed wiring. G21 is the speedometer, G22 is the sender, S13 is the fuse. oops, this is a 78 - not sure what yours would be with the '87 engine. 
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue Last edited by steely; 06-30-2012 at 02:07 PM.. |
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06-30-2012, 02:05 PM
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Thanks guys... I'll get to looking!
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1978 911 Turbo Cab Conversion w/1987 930 Engine |
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06-30-2012, 07:08 PM
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Join Date: May 2011
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You may want to look into this thread.
Replacing burnt parts in tachometer It describes a speedometer internal burn due to a blown capacitor on the electronics board. Not an uncommon problem. I have read about a similar experience on another thread.
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79 SC Targa 72 T Targa Sold 68 T Coupe Sold 65 912 Coupe Sold 62 356B Coupe Sold |
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06-30-2012, 08:18 PM
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